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A novel capacitive power transfer (CPT) structure through self-capacitance routes is proposed in this paper. Selfcapacitance is the nature property of an isolated conductor which represents the amount of charges that have to be added to a conductor to promote its potential by one unit with respect to infinity. By utilizing the self-capacitance effects, one of the two coupling capacitors for conventional...
Resonant energy link plays a vital role in the performance of inductive wireless power transfer (IPT) system, whereas the effective design method has not been actively investigated from a perspective of power conversion circuit. This paper presents a new graphical design method based on FOM-rd plane which gives convenience as well as insight to circuit designers. The proposed FOM-rd plane can estimate...
For a wireless transmission system, low efficiency is the most serious problem. Proper capacitance compensation for the system is expected to reduced reactive power and improve system efficiency. In present paper, system performances are studied and compared in two cases, no compensation and compensated by series capacitance. Then variation trend of transmission efficiency with other parameters (frequency,...
This paper presents the conditions for achieving maximum power output and maximum efficiency in a series–series (SS) resonant inductive link. It has been shown that output power depends on the nature of supply: current source or voltage source, resulting in different values for the same resonant link setup. For both types of sources, conditions for maximum power transfer with respect to different...
This paper presents a design procedure of a Class E2 DC-DC converter for megahertz wireless power transfer. The design formulas are analytically derived based on the input impedance of the Class E rectifier. A 6.78 MHz Class E2 DC-DC converter is designed and implemented by means of those formulas. The power-level of the converter is 15W. The experiments are provided to verify the proposed design...
This paper proposes the novel isolated capacitive power transfer outlet socket and plug using comb type capacitor. The detachable comb capacitor is proposed as a power supply connector. The target power at the first stage is decided as 100W. At first, optimization of structure and material of capacitive connectors is investigated in order to realize easy attachment and detachment. After consideration,...
Misalignment between the transmitter coil and the receiver coil would in some cases lead to significant power and efficiency decline in a wireless power transfer system. This paper implements the LCC compensation topology to improve the horizontal misalignment tolerance under a certain load condition. The reason for the efficiency decline under misalignment is firstly analyzed based on the equivalent...
The current popular technical paradigm insists high resonator quality factor Q, and by implication high frequency operation, is essential for efficient power transmission by means of resonant induction. This paper examines the theoretical argument and the experimental evidence against the current paradigm. It shows high frequency operation has few, if any, operational advantages and indeed has several...
For the application of on-board energy storage equipment of rail transit vehicle, the bi-directional DC/DC is the significant converter. Considering the converter and super-capacitor load, the paper proposes a wireless charging circuit topology for the light rail transit. And a dual side control strategy is proposed to not only meet the requirements of the system energy output, but also maintain the...
Class E rectifier is suitable for high-frequency rectification due to its soft-switching operation, which potentially improves the efficiency of wireless power transfer (WPT) systems working at MHz. In this paper, a robust optimization design is discussed for a 6.78-MHz WPT system using the Class E rectifier. In real WPT applications, the parameter variations are possible to be originated from the...
In this paper, by first analyzing the circuit model of series-parallel compensated inductive power transfer (IPT) system, the relation among voltage gain, transfer efficiency, operation frequency and load resistance is obtained. According to the analysis, a novel design of series-parallel compensated IPT system realizing optimized transfer efficiency and voltage gain regardless of load resistance...
We designed an auxiliary power supply for medium voltage MMC-converters with system voltages up to 36 kVrms. The system supplies up to 250 W power and is based on a two-stage design. The first stage is an inductive power transfer system that isolates against the system voltage. It is connected to a low voltage DC-supply on ground potential, and shows DC-DC efficiency between 90–95%. Two distinct insulation...
This paper introduces a Schematic Model of the Magnetic Coupling revolving in the NFC/RFID Systemusing a Computer Aided Design tool. Industry bodies are developing programs to improve NFC/RFID devices based on several specifications. Magnetic coupling is one of the most important factorsin near-field communication. Thus a Schematic Model is proposed, based on a precise standardized specifications...
This paper presents a technique for extending the operating frequency of an inductive link used for wireless power transfer. The extension is achieved by segmenting the primary inductor. A circuit model is proposed for a single-coil squared inductor, which provides the basis for the model of the segmented inductor. These models help to understand the operation of the segmented inductor and serve as...
In this paper thorough analysis of Series-Parallel resonant inductive coupling (SPRIC) has been presented using two-port network theory. Characteristic of SPRIC has been derived and plotted against load variation and frequency variation in MATLAB. Concept of forced resonance and natural resonance has been discussed. Important expressions such as current transfer ratio, voltage transfer ratio, maximum...
A wireless power transfer system can increase its system frequency to several Megahertz for large spatial freedom. A MHz system usually uses the same compensation as those kHz systems. Traditionally, the rectifier is modeled as a pure resistive load for the coupling coils when designing the compensation capacitors. However, the rectifier input reactance cannot be ignored for MHz systems. This reactance...
This paper proposes a loosely-coupled wireless power transfer (WPT) system without magnetic material, which has 95.0% dc-to-dc efficiency working at 1MHz and 3.3kW output power. The coil size is 320mm×320mm, and the coupling coefficient k is 14.0% at 150mm air-gap distance. The magnetic material is removed to increase system switching frequency to MHz level and eliminate the magnetic losses. Power...
The paper deals with the dynamic charging of the electric vehicles by an inductive power transfer (IPT) system with a segmented track. The reflexive properties of the IPT system is studied by evaluating the reactance of a transmitting coil when coupled with a pick-up with respect to uncoupled conditions. Different topologies for the pick-up circuit are evaluated, some of them introduced in this paper,...
The authors have proposed a new capacitive power transfer (CPT) system using one-pulse switching active capacitor (OPSAC). The proposed system improves transfer power without LC resonance so that it is robust against parameter change. The one of advantages of OPSAC is easy realization of cascade connection in order to enhance transfer power. In the past, CPT system with five-stage OPSAC was successfully...
This paper proposes to analyze the influence of the displacement of the capacitor plates on the performances of an electrical coupled contactless power transfer system. The armatures are of circular form and the values of their radii are different. Some formulae are obtained and based on them graphical representations are made in order to analyze the nonlinear behavior. Then these variable values...
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